BMW E39 Drive Belts & V-Belts

This is the Upper Idler Pulley, also known as the roller pulley or deflection pulley. The upper and lower idler pulleys are known to be the primary sources for 'belt squealing'. The pulley is also encased in rubber which will crack over time. If left without service the rubber could fail completely, chucking the belt and leaving you stranded. Replacement is a very simple procedure and can be done anytime the fan is off the engine (belt replacement, water pump service, alternator replacement, etc).

This pulley shares its mounting bolt with the alternator, and is used for the main drive belt on the M50-family engines (M50, M50TU, M52, S52, M52TU, M54, M56, and S54 engines), and also used on the S85 V10. This is the same belt that covers the water pump/alternator/power steering systems. Replacement is a very easy procedure (requires fan removal) and will have your engine purring in no time. Belt replacement is strongly recommended at the same time.

This item is 80mm Diameter. Please check the diameter before ordering.

Alternate part number: 11287841228

This upper idler pulley fits the following BMWs:
1991-1995 E34 525i (M50 engine)
1992-1999 E36 325i, 325is, 328i, 328is, 323is
1995-1999 E36 M3 (M3 3.0 & M3 3.2 liter)
1997-2003 E39 525i, 528i, 530i
1999-2000 E46 323i, 323Ci, 328i, 328Ci
2001-2005 E46 325i, 325Ci, 325xi, 330i, 330Ci, 330xi
2001-2006 E46 M3 coupe & convertible
2000-2006 X5 3.0 liter (E53 chassis)
2006-2009 M5 & M6 V10
1997-2002 Z3 & MZ3 2.5, 2.8, 3.0, M Roadster, M Coupe
2003-2009 Z4 & MZ4 Z4 M Coupe, Z4 M Roadster

This is the stock water pump pulley that mounts between the engine fan and the water pump. We have seen these plastic or composite pulleys crack around the mounting bolt holes. If left un-noticed the whole pulley can fall apart which will immediately disable the car and possibly leave you stranded. It can also break while performing other work around it such as removing the fan, replacing the water pump, or even just replacing the belt. Replacing this pulley while doing the water pump can be a good preventative measure.

This pulley is available in two different styles - the stock plastic or a stronger aluminum version. The same drawbacks with the stock pulley also apply to this plastic version. But if you're replacing the water pump on a regular basis then you should also replace the plastic pulley. The aluminum pulley will obviously last much longer. Both are the same size as the stock original pulley.

This item fits the following BMWs:
1992-1998 E36 BMW 323is 323ic 325i 325is 325ic 328i 328is 328ic M3
1997-1998 E39 BMW 528i
1997-1998 Z3 BMW Z3 2.8
1998-2000 Z3 BMW M Roadster M Coupe

This belt drives the air conditioning compressor for the AC system. We recommend checking your belts every 10,000 miles. If your belts have excessive cracks, dry rot, missing teeth and/or grooves, are cause noise, it's time for new ones. This belt fits M52/S52 engines, including:

1996-1999 M3, 328i, 328is, 323is (including convertibles)
1992-1995 525i & 525i Wagon
1997-1998 528i thru 02/98
1998-2000 M Roadster & Coupe
1997-2000 Z3 2.3, 2.5, 2.8 & 2.8 Coupe

This belt drives the air conditioning compressor for the AC system. We recommend checking your belts every 10,000 miles. If your belts have excessive cracks, dry rot, missing teeth and/or grooves, are cause noise, it's time for new ones.

This item fits the following BMWs:
2003-2005 E46 BMW 325i 325ci 325xi 330i 330ci 30xi
2003 E39 BMW 525i 530i
2004-2006 E83 BMW X3 2.5i X3 3.0i
2003-2006 E53 BMW X5 3.0i
2003-2006 Z4 BMW Z4 2.5i Z4 3.0i

This belt drives the air conditioning compressor for the AC system. We recommend checking your belts every 10,000 miles. If your belts have excessive cracks, dry rot, missing teeth and/or grooves, are cause noise, it's time for new ones.

This item fits the following BMWs:
1999-2002 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi
3/1998-2002 E39 BMW 525i 528i 530i
2000-2002 E53 BMW X5 3.0i
2001-2002 Z3 BMW Z3 2.5i Z3 3.0i

This is the main drive belt / serpentine belt that drives all of the engine auxillaries, such as the alternator, waterpump, and power steering pump. If your belt has excessive cracks, dry rot, missing teeth and/or grooves, or are causing noise, it's time for a new one.

1992-1999 M3, 325i, 325is, 328i, 328is, 323is (including convertibles)
1991-1995 525i & 525i Wagon
1997-1998 528i
1997-2000 2.8 & 2.8 Coupe

This serpentine belt drives the alternator,water pump and power steering pump. The belt size is 7k X 1635.

This item fits the following BMWs:
1999-2003 E39 BMW 540i
1999-2001 E38 BMW 740i 740il
2000-2006 E53 BMW X5 4.4i